There has been, over the last months, much more chatter about Robert Plant’s private affairs with Patty Griffin than anything they’ve done in the studio. “Ohio,” from Griffin’s upcoming release American Kid, changes that.

What’s the continuing attraction, in 2012, for the long-gone Led Zeppelin? From movie trailers to “American Idol,” these long-haired, often-shirtless heavy-metal rock-gods — disbanded since the turn of the 1980s, mind you — remain front of mind.